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Effect of Flowfield Non-Uniformities on Emissions Predictions in HSDI Engines
Technical Paper
2011-01-0821
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The role of the fluid motion in a diesel engine on mixing and combustion was investigated using the CFD code Kiva-3v. The study considered pre-mixed charge compression ignition (PCCI) combustion that is a hybrid combustion system characterized by early injection timings and high amounts of EGR dilution to delay the start and lower the temperature of combustion. The fuel oxidizer mixture is not homogeneous at the start of combustion and therefore requires further mixing for complete combustion. PCCI combustion systems are characterized by relatively high CO and UHC emissions. This work investigates attenuating CO emissions by enhancing mixing processes through non-uniform flowfield motions. The fluid motion was characterized by the amount of average angular rotation about the cylindrical axis (swirl ratio) and the amount of non-uniform motion imparted by the relative amounts of mass inducted through tangential and helical intake ports in a 0.5L HSDI diesel engine. Non-uniform fluid motion, characterized by counter-rotating vortices, was found to contribute to a decrease in the amount of pollutant formation at varying levels of swirl ratio. The attenuation of CO could be significant (~15%) but insufficient to decrease the pollutant levels to desired levels without further after-treatment.
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Bergin, M. and Reitz, R., "Effect of Flowfield Non-Uniformities on Emissions Predictions in HSDI Engines," SAE Technical Paper 2011-01-0821, 2011, https://doi.org/10.4271/2011-01-0821.Also In
References
- Amsden, A.A. KIVA-3V, Release 2, Improvements to KIVA-3V
- Kook, S. Bae, C. Miles, P. Choi, D. Bergin, M. Reitz, R. D. “The Effect of Swirl Ratio and Fuel Injection Parameters on CO Emission and Fuel Conversion Efficiency for High-Dilution, Low-Temperature Combustion in an Automotive Diesel Engine,” SAE Technical Paper 2006-01-0197 2006 10.4271/2006-01-0197
- Akihama, K. Takatori, Y. Inagaki, K. Sasaki, S. Dean, A. “Mechanism of the Smokeless Rich Diesel Combustion by Reducing Temperature,” SAE Technical Paper 2001-01-0655 2001 10.4271/2001-01-0655
- Opat, R. Ra, Y. Gonzalez, M. A. Krieger, R. Reitz, R. Foster, D. Durrett, R. Siewert, R. “Investigation of Mixing and Temperature Effects on HC/CO Emissions for Highly Dilute Low Temperature Combustion is a Light Duty Diesel Engine,” SAE Technical Paper 2007-01-0193 2007 10.4271/2007-01-0193
- Wiles, M. Probst, D. Ghandhi, J. “Bulk Cylinder Flowfield Effects on Mixing in DISI Engines” SAE Technical Paper 2005-01-0096 2005 10.4271/2005-01-0096
- Heywood, John, B. “Internal Combustion Engine Fundamentals” 1988
- White, F. “Fluid Mechanics” 1999
- Reitz, R. D. “Modeling atomization processes in high pressure vaporizing sprays” Atomization and Spray Technology 3 309 337 1987
- Reitz, R. D. Diwakar, R. “Structure of High Pressure Fuel Sprays,” SAE Technical Paper 870598 1987 10.4271/870598
- Su, T. F. Patterson, M. A. Reitz, R. D. Farrell, P. V. “Experimental and Numerical Studies of High Pressure Multiple Injection Sprays,” SAE Technical Paper 960861 1996 10.4271/960861
- Patel, A. Kong, S.C. Reitz, R.D. “Development and Validation of a Reduced Reaction Mechanism for HCCI Engine Simulations,” SAE Technical Paper 2004-01-0558 2004 10.4271/2004-01-0558
- Kee, R.J. Rupley, F.M. Miller, J.A. “CHEMKINII: A Fortran Chemical Kinetics Package for the Analysis of Gas-Phase Chemical Kinetics,” Sandia Report, SAND 89-8009 1989
- WERC, LLC Madison, WI 2007